Works like a dream. On a full kitchen run it emptied 90% of the water in the tank and the dirty tank was over 50% full. I’ll measure it, but this is easily twice as much liquid as it has ever put down before. Note this is a non-upgraded 450 as the upgrade is no longer possible to install.
I’d say “works as factory new” at this point. So plumbing in a new line and going around those stupid gaskets is the way to get your 450 back to peak performance!